1Overview 2 3The Dell Systems Management Base Driver provides a sysfs interface for 4systems management software such as Dell OpenManage to perform system 5management interrupts and host control actions (system power cycle or 6power off after OS shutdown) on certain Dell systems. 7 8Dell OpenManage requires this driver on the following Dell PowerEdge systems: 9300, 1300, 1400, 400SC, 500SC, 1500SC, 1550, 600SC, 1600SC, 650, 1655MC, 10700, and 750. Other Dell software such as the open source libsmbios project 11is expected to make use of this driver, and it may include the use of this 12driver on other Dell systems. 13 14The Dell libsmbios project aims towards providing access to as much BIOS 15information as possible. See http://linux.dell.com/libsmbios/main/ for 16more information about the libsmbios project. 17 18 19System Management Interrupt 20 21On some Dell systems, systems management software must access certain 22management information via a system management interrupt (SMI). The SMI data 23buffer must reside in 32-bit address space, and the physical address of the 24buffer is required for the SMI. The driver maintains the memory required for 25the SMI and provides a way for the application to generate the SMI. 26The driver creates the following sysfs entries for systems management 27software to perform these system management interrupts: 28 29/sys/devices/platform/dcdbas/smi_data 30/sys/devices/platform/dcdbas/smi_data_buf_phys_addr 31/sys/devices/platform/dcdbas/smi_data_buf_size 32/sys/devices/platform/dcdbas/smi_request 33 34Systems management software must perform the following steps to execute 35a SMI using this driver: 36 371) Lock smi_data. 382) Write system management command to smi_data. 393) Write "1" to smi_request to generate a calling interface SMI or 40 "2" to generate a raw SMI. 414) Read system management command response from smi_data. 425) Unlock smi_data. 43 44 45Host Control Action 46 47Dell OpenManage supports a host control feature that allows the administrator 48to perform a power cycle or power off of the system after the OS has finished 49shutting down. On some Dell systems, this host control feature requires that 50a driver perform a SMI after the OS has finished shutting down. 51 52The driver creates the following sysfs entries for systems management software 53to schedule the driver to perform a power cycle or power off host control 54action after the system has finished shutting down: 55 56/sys/devices/platform/dcdbas/host_control_action 57/sys/devices/platform/dcdbas/host_control_smi_type 58/sys/devices/platform/dcdbas/host_control_on_shutdown 59 60Dell OpenManage performs the following steps to execute a power cycle or 61power off host control action using this driver: 62 631) Write host control action to be performed to host_control_action. 642) Write type of SMI that driver needs to perform to host_control_smi_type. 653) Write "1" to host_control_on_shutdown to enable host control action. 664) Initiate OS shutdown. 67 (Driver will perform host control SMI when it is notified that the OS 68 has finished shutting down.) 69 70 71Host Control SMI Type 72 73The following table shows the value to write to host_control_smi_type to 74perform a power cycle or power off host control action: 75 76PowerEdge System Host Control SMI Type 77---------------- --------------------- 78 300 HC_SMITYPE_TYPE1 79 1300 HC_SMITYPE_TYPE1 80 1400 HC_SMITYPE_TYPE2 81 500SC HC_SMITYPE_TYPE2 82 1500SC HC_SMITYPE_TYPE2 83 1550 HC_SMITYPE_TYPE2 84 600SC HC_SMITYPE_TYPE2 85 1600SC HC_SMITYPE_TYPE2 86 650 HC_SMITYPE_TYPE2 87 1655MC HC_SMITYPE_TYPE2 88 700 HC_SMITYPE_TYPE3 89 750 HC_SMITYPE_TYPE3 90 91 92